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Static relativistic finite gas normalization and hydrostatics

Statement

Let Ix0⊆R be an open interval and B⊂R3 an open bounded coordinate box with compact closure and positive volume. On a neighborhood of Ix0×B‾, with x0=ct assigned metres and t in seconds, prescribe the smooth static metric g=−N(x)2(dx0)2+hij(x)dxidxj, where hij is positive definite with eigenvalues bounded above and away from zero, and the lapse satisfies 0<N0≤N(x)≤N1<∞. The static unit observer is u=N−1∂x0, so g(u,u)=−1; this is a prescribed background, not a solution sourced by the gas.

Use SI units: particle mass m>0 is in kg, c>0 is in m s−1, orthonormal momentum p^ is in kg m s−1, and local energy E is in J. In any local orthonormal coframe, pi=eiap^a and hij=∑aeiaeja, so dVh d3p^=d3x d3pi; orthonormal-frame changes are rotations and preserve d3p^. This defines a fibre measure without assuming a global frame. Use the fixed action reference h∗>0 in J s and βK>0 in J−1: E(p^)=m2c4+c2∣p^∣2,HK(x,p^)=N(x)E(p^),Z1(βK)=∫B∫R3e−βKHKdVh d3p^h∗3. Then 0<Z1<∞, with all polynomial momentum moments and compact-positive-βK derivatives finite. For each fixed particle count M≥1, the classical ideal-gas preparation with Gibbs factor 1/M! has ZM=Z1M/M!; a grand fugacity preparation with dimensionless z>0 has Ξ=exp⁡(zZ1).

Define f(x,p^)=zh∗−3e−βKHK and the proper local densities n(x)=∫f d3p^,ε(x)=∫Ef d3p^,P(x)=13∫p^⋅∇p^E f d3p^. Their units are m−3, J m−3, and J m−3, respectively. With βloc=βKN(x) and TK=(kBβK)−1, the exact model identities are Tloc(x)=1kBβloc=TKN(x),P=nkBTloc,∂iP=−(ε+P)∂ilog⁡N. If z=eβKμK with μK in joules, the local chemical parameter is μloc=μK/N. No Einstein equation, self-consistent gas backreaction, interacting quantum trace, or arbitrary curved-space mode spectrum is asserted.

Facts & Assumptions

Given: A bounded positive-volume region, smooth prescribed static metric data satisfying the stated uniform bounds, m,c,h∗,kB,βK,z>0, and the classical ideal-gas preparation.

[F1]

The phase-reference item fixes the action unit h∗ and the convention that a phase integral is dimensionless after division by its corresponding power. (Finite gravitational phase and entropy reference)

[F2]

If an integrable section is differentiable in a parameter and its derivative has an integrable uniform majorant on a neighborhood, differentiation passes through the integral. (Differentiation under the integral sign)

[F3]

Tonelli factors nonnegative measurable integrals on products of sigma-finite measure spaces. (Tonelli's theorem for nonnegative measurable functions on a sigma-finite product)

Proof

1.1F1algebra

In a local orthonormal coframe, pi=eiap^a and hij=∑aeiaeja, so ∣det⁡(eia)∣=det⁡h. Hence d3pi=det⁡h d3p^ and d3x d3pi=dVh d3p^. The transition matrix between orthonormal coframes is orthogonal and has absolute determinant one, so this fibre measure is independent of the chosen local coframe.

1.2F1F2F3givenalgebra

In the orthonormal momentum variables, E(p^)≥c∣p^∣, so e−βKNE≤e−βKN0c∣p^∣. The right side is integrable on R3: ∣p^∣≥(∣p^1∣+∣p^2∣+∣p^3∣)/3 reduces its integral to a product of three finite one-dimensional exponential integrals. The same comparison with polynomial factors gives every energy moment and a common majorant for βK in compact positive intervals. Each βK derivative of the integrand is (−HK)je−βKHK; [F2] therefore gives Z1(j)=∫(−HK)je−βKHKdVh d3p^/h∗3 for every finite order. The proper volume of B‾ is finite by compactness and the metric eigenvalue bounds, and positive because B has positive volume and det⁡h>0. Thus Z1 is finite and strictly positive. For M independent labelled particles, Tonelli [F3] factors the product integral; the fixed classical indistinguishable-particle counting convention divides by M!, giving ZM=Z1M/M!. Summing grand weights yields ∑M≥0(zZ1)M/M!=ezZ1.

2.1givenstep 1.2algebra

At a fixed x, put βloc=βKN(x). On a momentum cube [−R,R]3, integrate ∑i=13∂p^i(p^ie−βlocE)=3e−βlocE−βloc(p^⋅∇p^E)e−βlocE. The constant factor zh∗−3 in f cancels from the moments. Here ∇p^E=c2p^/E and p^⋅∇p^E≤c∣p^∣, so the divergence terms are integrable under the exponential bound of step 1.2. On a face with ∣p^i∣=R, ∣p^∣≥R and ∣p^∣≥(∣p^j∣+∣p^k∣)/2, hence ∣p^∣≥R/2+(∣p^j∣+∣p^k∣)/(22). Each face integral is therefore bounded by a constant times Re−βloccR/2∫R2e−βlocc(∣y∣+∣z∣)/(22)dy dz, which tends to zero. The integral of the divergence over R3 is zero, and division by 3βloc gives P=n/βloc=nkBTloc.

3.1F1F2step 1.2step 2.1algebra∎

For each spatial coordinate xi, ∂if=−βK(∂iN)Ef. The derivatives of the lapse are bounded on the compact closure, N≥N0, and Ef has the integrable majorant from step 1.2. Hence [F2] gives ∂in=−βK(∂iN)ε. Differentiating P=n/(βKN) and substituting this identity yields ∂iP=−εN∂iN−nβKN2∂iN=−(ε+P)∂ilog⁡N. Finally, rewriting βK(NE−μK) as βloc(E−μloc) gives μloc=μK/N.

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